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Anthony Iemole 🇺🇦
@SpaceXFan97 · 11. Feb. 2019
Wow! I assume the switch to Stainless Steel is a big factor in this?
Elon Musk
@elonmusk · 11. Feb. 2019
Yes
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Robotbeat🗽 ➐
@Robotbeat · 11. Feb. 2019
What cost per engine will you achieve, given similar comparison to Merlin? How many Raptors could you make per year given similar resources as you currently use for Merlin?
Elon Musk
@elonmusk · 11. Feb. 2019
This will sound implausible, but I think there’s a path to build Starship / Super Heavy for less than Falcon 9
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Eric Ralph
@13ericralph31 · 11. Feb. 2019
Is the SL engine's expected vac ISP relatively unchanged from IAC 2017?
Elon Musk
@elonmusk · 11. Feb. 2019
Close
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Elon Musk
@elonmusk · 11. Feb. 2019
Yes, aiming for 380 sec Isp with vac nozzle. Maybe 382 if we get lucky.
Elon Musk
@elonmusk · 11. Feb. 2019
But not an extendable nozzle though, as that just saves length. Nozzle diameter is limited by body diameter.
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Anthony Iemole 🇺🇦
@SpaceXFan97 · 11. Feb. 2019
I know you said Raptor would eventually reach 300 bar, but will you stop there or go furthur? 300 is already impressive but is it capable of more?
Elon Musk
@elonmusk · 11. Feb. 2019
Much above 300 bar main chamber pressure means extreme oxygen preburner pressure of 700 to 800+ bar. Definitely pushing the limit of known physics.
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Elon Musk
@elonmusk · 11. Feb. 2019
Antwort an @_cgp
Propellant was not deep cryo. CH4 & O2 were just barely below liquid temp at 1 bar. In theory, Raptor should do ~300 bar at deep cryo, provided everything holds together, which is far from certain. However, only 250 bar is needed for nominal operation of Starship/Super Heavy.
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Just A. Tinker
@John_Gardi · 11. Feb. 2019
Are you considering an extendable nozzle for Raptor at any time?
Would love to see a nozzle that could extend during flight to provide extra ISP!
Elon Musk
@elonmusk · 11. Feb. 2019
Yes, aiming for 380 sec Isp with vac nozzle. Maybe 382 if we get lucky.
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Eric Ralph
@13ericralph31 · 11. Feb. 2019
Wow :D Can you say how many tests have been performed thus far? I doubt it can speak much to the long-term longevity of Raptor, but I feel like 3-5+ static fires in the first 7 freaking days of integrated hot-fires is a damn good sign.
Elon Musk
@elonmusk · 11. Feb. 2019
I think 6 where we lit main chamber & several with only preburners
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John Kraus
@johnkrausphotos · 11. Feb. 2019
What was the duration of the test fire?
Elon Musk
@elonmusk · 11. Feb. 2019
About 11 secs
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Alexandre Andrianov MD
@alexmd2 · 11. Feb. 2019
I know people who worked on РД 180. Its still an amazing engine though.
Elon Musk
@elonmusk · 11. Feb. 2019
Definitely! It’s amazing that the RD-170 & RD-180 engines held the record for so many decades. Excellent engineering.
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Elon Musk
@elonmusk · 7. Feb. 2019
Design requires at least 170 metric tons of force. Engine reached 172 mT & 257 bar chamber pressure with warm propellant, which means 10% to 20% more with deep cryo.
Elon Musk
@elonmusk · 11. Feb. 2019
Raptor reached 268.9 bar today, exceeding prior record held by the awesome Russian RD-180. Great work by @SpaceX engine/test team!
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Elon Musk
@elonmusk · 10. Feb. 2019
Antwort an @lc39a
I was simply too sexy for it
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Elon Musk
@elonmusk · 9. Feb. 2019
Antwort an @leo190102
Maybe tomorrow
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Elon Musk
@elonmusk · 9. Feb. 2019
Just left Zeebrugge, now Tilburg, then Tesla HQ in Amsterdam & Oslo tonight to review service in Norway. Exciting to see thousands of Model 3’s on their way to owners in Europe!
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bill lee
@billlee · 9. Feb. 2019
Careful - the National Enquirer may want some.
Elon Musk
@elonmusk · 9. Feb. 2019
Hope they don’t find this pic!
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Elon Musk
@elonmusk · 9. Feb. 2019
😅 thank goodness it’s not November
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Bobby_kincaid
@Bkin87 · 9. Feb. 2019
Stop tweeting yourself 🤣🤣
Elon Musk
@elonmusk · 9. Feb. 2019
a
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Elon Musk
@elonmusk · 9. Feb. 2019
Send me hot pics & I’ll be right over 😉
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Elon Musk
@elonmusk · 8. Feb. 2019
I want you too baby
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Elon Musk
@elonmusk · 8. Feb. 2019
Joe Rogan describes Tesla for 4 mins & 20 secs
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